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2014-06-11T14:09:50+07:00
K = 4s
82 = 4s
s = 82/4
s = 20,5 cm

Luas = s*s
L = 20,5 * 20,5
L = 420,25 cm²
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2014-06-11T14:11:49+07:00
Keliling persegi= 4xs
82=4s
s=82/4 =20,5

luas persegi=  s^{2}
luas persegi=  20,5^{2} = 420,25
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